[fpc-devel] ref count issue with out param

[Martin Frb]

On 13/06/2015 10:05, Jonas Maebe wrote:
> Martin Frb wrote:
>> ebx is a temp copy of s1, but then f1 becomes nil, and ebx points to
>> freed memory.
>
> It's because "out" finalises on the caller side (due to its COM 
> origin, I guess) while value parameters get their reference count 
> increased on the callee side (for efficiency reasons, I guess). This 
> is all Delphi-compatible.

Ok. that's why I asked before deciding if reporting.

I knew that the value of s1 (as in empty versus the last strings 
content) was more or less unpredictable.

But I thought that ref-counting was save, except for "const". This is 
why I asked.